[File UI] Added support for custom line positioning in file editor.

- Adds the ability to select lines from the editor, which in turn will
  highlight them.

- Adds the ability to load a file and scroll at a specific line if the
  URL has with the `line` argument.

- Adds the ability to maximize the file editor modal.

platypush/backend/http/webapp/src/components/File/Editor.vue

@@ -9,10 +9,15 @@
 
       <div class="editor-body">
         <div class="line-numbers" ref="lineNumbers">
-          <span class="line-number" v-for="n in lines" :key="n" v-text="n" />
+          <span class="line-number"
+                :class="{selected: selectedLine === n}"
+                v-for="n in lines"
+                :key="n"
+                @click="selectedLine = selectedLine === n ? null : n"
+                v-text="n" />
         </div>
 
-        <pre ref="pre"><code ref="content" v-html="displayedContent" /></pre>
+        <pre ref="pre"><code ref="content" v-html="displayedContent" /><div class="selected-line" ref="selectedLine" v-if="selectedLine != null" /></pre>
         <textarea ref="textarea" v-model="content" @scroll="syncScroll" @input.stop />
       </div>
 
@@ -54,6 +59,11 @@ export default {
       default: false,
     },
 
+    line: {
+      type: [String, Number],
+      default: null,
+    },
+
     withSave: {
       type: Boolean,
       default: true,
@@ -71,6 +81,7 @@ export default {
       initialContentHash: 0,
       loading: false,
       saving: false,
+      selectedLine: null,
       type: null,
     }
   },
@@ -139,6 +150,12 @@ export default {
       } finally {
         this.loading = false
       }
+
+      if (this.selectedLine) {
+        setTimeout(() => {
+          this.scrollToLine(this.selectedLine)
+        }, 1000)
+      }
     },
 
     async saveFile() {
@@ -190,6 +207,17 @@ export default {
       })
     },
 
+    scrollToLine(line) {
+      const offset = (line - 1) * parseFloat(getComputedStyle(this.$refs.pre).lineHeight)
+      this.$refs.textarea.scrollTo({
+        top: offset,
+        left: 0,
+        behavior: 'smooth',
+      })
+
+      return offset
+    },
+
     highlightContent() {
       this.highlighting = true
 
@@ -243,7 +271,7 @@ export default {
     },
 
     reset() {
-      this.setUrlArgs({file: null})
+      this.setUrlArgs({file: null, line: null})
       this.removeBeforeUnload()
       this.removeKeyListener()
     },
@@ -276,9 +304,36 @@ export default {
         this.highlightedContent = this.content
       }
     },
+
+    selectedLine(line) {
+      line = parseInt(line)
+      if (isNaN(line)) {
+        return
+      }
+
+      const textarea = this.$refs.textarea
+      const lines = this.content.split('\n')
+      const cursor = lines.slice(0, line - 1).join('\n').length + 1
+
+      textarea.setSelectionRange(cursor, cursor)
+      textarea.focus()
+      this.setUrlArgs({line})
+      this.$nextTick(() => {
+        const offset = this.scrollToLine(line)
+        this.$refs.selectedLine.style.top = `${offset}px`
+      })
+    },
   },
 
   mounted() {
+    const args = this.getUrlArgs()
+    const line = parseInt(this.line || args.line || 0)
+    if (line) {
+      if (!isNaN(line)) {
+        this.selectedLine = line
+      }
+    }
+
     this.loadFile()
     this.addBeforeUnload()
     this.addKeyListener()
@@ -332,8 +387,10 @@ $line-numbers-width: 2.5em;
   }
 
   .editor-body {
+    font-family: $monospace-font;
+
     pre, textarea, code, .line-numbers {
-      font-family: 'Fira Code', 'Noto Sans Mono', 'Inconsolata', 'Courier New', monospace;
+      font-family: $monospace-font;
       position: absolute;
       top: 0;
       height: 100%;
@@ -341,6 +398,10 @@ $line-numbers-width: 2.5em;
       white-space: pre;
     }
 
+    pre, textarea, code {
+      background: transparent;
+    }
+
     .line-numbers {
       width: $line-numbers-width;
       background: $tab-bg;
@@ -356,6 +417,15 @@ $line-numbers-width: 2.5em;
         width: 100%;
         text-align: right;
         padding-right: 0.25em;
+        cursor: pointer;
+
+        &:hover {
+          background: $hover-bg;
+        }
+
+        &.selected {
+          background: $selected-bg;
+        }
       }
     }
 
@@ -372,16 +442,32 @@ $line-numbers-width: 2.5em;
       background: transparent;
       overflow-wrap: normal;
       overflow-x: scroll;
-      z-index: 1;
+      z-index: 2;
       color: rgba(0, 0, 0, 0);
       caret-color: black;
       border: none;
       outline: none;
     }
+
+    .selected-line {
+      position: absolute;
+      top: 0;
+      left: 0;
+      width: 100%;
+      height: 1.5em;
+      background: rgba(110, 255, 160, 0.25);
+    }
   }
 
   :deep(.floating-btn) {
     z-index: 5;
   }
+
+  // Fix for some hljs styles that render white text on white background
+  :deep(code) {
+    .hljs-subst {
+      color: $selected-fg !important;
+    }
+  }
 }
 </style>

platypush/backend/http/webapp/src/components/File/EditorModal.vue

@@ -8,6 +8,7 @@
           <FileEditor ref="fileEditor"
                       :file="file"
                       :is-new="isNew"
+                      :line="line"
                       @save="$emit('save', $event)"
                       v-if="file" />
         </div>
@@ -26,10 +27,11 @@
 import ConfirmDialog from "@/components/elements/ConfirmDialog";
 import FileEditor from "./Editor";
 import Modal from "@/components/Modal";
+import Utils from '@/Utils'
 
 export default {
   emits: ['close', 'open', 'save'],
-  mixins: [Modal],
+  mixins: [Modal, Utils],
   components: {
     ConfirmDialog,
     FileEditor,
@@ -47,6 +49,11 @@ export default {
       default: false,
     },
 
+    line: {
+      type: [String, Number],
+      default: null,
+    },
+
     withSave: {
       type: Boolean,
       default: true,
@@ -113,15 +120,28 @@ export default {
 
     onClose() {
       this.$refs.fileEditor.reset()
+      this.setUrlArgs({ maximized: null })
       this.$emit('close')
     },
   },
+
+  watch: {
+    maximized() {
+      this.setUrlArgs({ maximized: this.maximized })
+    },
+  },
+
+  mounted() {
+    this.maximized = !!this.getUrlArgs().maximized
+  },
 }
 </script>
 
 <style lang="scss" scoped>
 @import "src/style/items";
 
+$maximized-modal-header-height: 2.75em;
+
 .file-editor-root {
   .file-editor-modal {
     :deep(.modal) {
@@ -133,14 +153,18 @@ export default {
 
       .modal-body {
         width: 100%;
-        height: 50em;
         min-width: 30em;
         max-height: calc(100vh - 2em);
       }
+
+      .content {
+        @extend .expand;
+      }
     }
 
     &:not(.maximized) {
-      :deep(.body) {
+      :deep(.modal) {
+        .body {
           @include until($tablet) {
             width: calc(100vw - 2em);
           }
@@ -154,24 +178,48 @@ export default {
             width: 100%;
             min-width: 50em;
           }
+
+          .modal-body {
+            height: 50em;
+          }
+        }
       }
     }
 
     &.maximized {
-      :deep(.body) {
-        width: 100vw;
-        height: 100vh;
+      :deep(.modal) {
+        width: calc(100vw - 2em);
+        height: calc(100vh - 2em);
+
+        .content, .modal-body {
+          width: 100%;
+          height: 100%;
+          max-height: 100%;
+        }
+
+        .header {
+          height: $maximized-modal-header-height;
+        }
+
+        .body {
+          height: calc(100% - #{$maximized-modal-header-height});
+          max-height: 100%;
+        }
       }
     }
   }
 
   .confirm-dialog-container {
     :deep(.modal) {
-      .content {
-        .body {
-          min-width: 30em;
+      width: 35em !important;
+      height: 9em !important;
       max-width: 100%;
-        }
+      max-height: 100%;
+
+      .body {
+        width: 100% !important;
+        height: 100% !important;
+        justify-content: center;
       }
     }
   }